Subtract 84/70 from 15/21
1st number: 15/21, 2nd number: 1 14/70
15/21 - 84/70 is -17/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
15/21 = 15 × 10/21 × 10 = 150/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
84/70 = 84 × 3/70 × 3 = 252/210 - Subtract the two like fractions:
150/210 - 252/210 = 150 - 252/210 = -102/210 - After reducing the fraction, the answer is -17/35
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